CVE-2026-27891: Facturascripts/facturascripts Remote Code Execution Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-3pgc-xqg9-cfr6",
  "modified" : "2026-05-07T19:32:14Z",
  "published" : "2026-05-07T19:32:14Z",
  "aliases" : [ "CVE-2026-27891" ],
  "summary" : "FacturaScripts Vulnerable to Remote Code Execution (RCE) via Zip Slip in Plugin Upload Mechanism",
  "details" : "### Summary\nA Critical vulnerability exists in the `Plugins::add()` function. The system fails to properly validate the file paths within uploaded ZIP archives. This allows an attacker to perform a Zip Slip attack, leading to Arbitrary File Write and Remote Code Execution (RCE) by overwriting sensitive .php files outside the designated plugins directory.\n\n### Details\nThe vulnerability is located in Plugins.php. While the `testZipFile` function attempts to validate that the ZIP contains only one root folder, it does not sanitize or validate the individual file paths within that folder.\n```js\n// Vulnerable logic in Plugins.php\nfor ($index = 0; $index < $zipFile->numFiles; $index++) {\n    $data = $zipFile->statIndex($index);\n    $path = explode('/', $data['name']);\n    if (count($path) > 1) {\n        $folders[$path[0]] = $path[0];\n    }\n} \n```\nAn attacker can bypass this check by naming a file `ValidPluginName/../../shell.php`. The explode function will see ValidPluginName as the root folder, satisfying the `count($folders) != 1` check. However, during extraction, the `../../` sequence triggers a path traversal, allowing the file to be written anywhere the web server has permissions the root directory.\n### PoC\nPrepare Malicious ZIP: Use a tool (like evilarc) or a script to create a ZIP file where one of the entries is named: `MyPlugin/../../rce.php`\nInject Payload: Inside rce.php, put a simple shell: \n`<?php system($_GET['cmd']); ?>`\nUpload: Navigate to the \"Add Plugin\" section in FacturaScripts and upload the malicious ZIP.\nExecution: Access the shell via https://target.com/rce.php?cmd=whoami.\n\n### Impact\nConfidentiality: High (Attacker can read all database configs and files).\nIntegrity: High (Attacker can modify any file on the server).\nAvailability: High (Attacker can delete the entire installation).\n> https://github.com/ZeroXJacks/CVEs/blob/main/2026/CVE-2026-27891.md",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "facturascripts/facturascripts"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "2025.71"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/NeoRazorX/facturascripts/security/advisories/GHSA-3pgc-xqg9-cfr6"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/NeoRazorX/facturascripts"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20", "CWE-434" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-07T19:32:14Z",
    "nvd_published_at" : null
  }
}